5
INTERNAL WORKINGS SCHEMATIC
P
2
P
1
P
t
P
s
P
t
A
B
PILOT
BOOST STAGE
PUMP
LINKAGE
SWASHPLATE
P
s
P
s
1393B
PERFORMANCE
HYSTERESIS
Less than 7 psi divided by the scale factor. Measured at
a frequency of .01 Hz at 30% of rated current when run
from plus to minus 98 psi divided by the scale factor
SYMMETRY
The differences in the currents to drive to either side of
rated output will not exceed 15%
LINEARITY
No point plotted on the current/swashplate angle curve
shall fall outside the area defined by a
±
10% slope
deviation from the scale factor, exclusive of the
deadband
FAIL SAFETY
The spool will return to neutral if the electrical signal is
disconnected or if the pilot output pressure goes to case
pressure. Mechanical feedback must be present.
FREQUENCY RESPONSE
(EXCEPT FOR 130 cc PUMPS)
2 Hz minimum with .052 pressure limiter orifices
3 Hz minimum without pressure limiter orifices (with
pressure limiters inoperative)
Under 500-1000 psi load at 90
°
phase lag with 10 mA
signal at 45 mA offset
TIME RESPONSE (EXCEPT FOR 130 CC PUMPS)
1.0 seconds (0 to full stroke with .052 pressure limiter
orifices)
2.0 seconds (full to full stroke with .052 pressure limiter
orifices)
.30 seconds (0 to full stroke without pressure limiter
orifices)
.40 seconds (full to full stroke without pressure limiter
orifices)
under 500-1000 load conditions
SENSITIVITY
The valve will respond to a 2% change in input current
throughout the rated current range except for the
deadband region
DIMENSIONS
See the Dimension drawings
BLN-95-8995-4
